Researchers have analyzed drinking water and detected oocysts of Cryptosporidium and cysts of Giardia, two protozoa that cause outbreaks of diarrhea in humans. The levels detected are very low and do ...

Protozoan parasites represent a persistent and multifaceted threat to marine aquaculture, affecting a broad range of farmed species from finfish to shellfish across temperate and tropical regions.

A parasite is an organism that lives in or on an organism of another species. Three main classes of parasites can cause disease in humans: protozoa, helminths, and ectoparasites. Protozoa and ...

Parasitism occurs when one species — the parasite — benefits from resources it takes from another, usually larger, host species to the detriment of host individuals. Why some host individuals carry ...